Azizitorghabeh Atefeh, Mahandra Harshit, Ramsay Juliana, Ghahreman Ahmad
Hydrometallurgy and Environment Laboratory, Robert M. Buchan Department of Mining, Queen's University, 25 Union Street, Kingston, Ontario K7L 3N6, Canada.
Department of Chemical Engineering, Queen's University, 19 Division Street, Kingston, Ontario K7L 3N6, Canada.
ACS Omega. 2021 Jun 29;6(27):17183-17193. doi: 10.1021/acsomega.1c00525. eCollection 2021 Jul 13.
Thiocyanate (SCN) is a promising alternative to cyanide as a lixiviant for gold extraction and is 1000 times less toxic than cyanide. In this study, the following leaching parameters were tested to optimize the gold recovery for the first time from an oxide ore using the response surface methodology: initial thiocyanate concentration (10-500 mM), initial Fe concentration (10-500 mM), and pulp density (10-50% w/v). The maximum gold recovery (96%) was achieved with 500 mM thiocyanate, 100 mM Fe, and 50% pulp density at 25 °C and pH = 2 for 24 h. A kinetic study on the optimum leaching condition showed that it followed the shrinking core model, in which the rate-controlling mechanism was the diffusion process. These results are discussed in the context of the published literature.
硫氰酸盐（SCN）作为一种用于金提取的浸出剂，是氰化物很有前景的替代品，其毒性比氰化物小1000倍。在本研究中，首次使用响应面法测试了以下浸出参数，以优化从氧化矿石中回收金的效果：初始硫氰酸盐浓度（10 - 500 mM）、初始铁浓度（10 - 500 mM）和矿浆密度（10 - 50% w/v）。在25°C、pH = 2的条件下，使用500 mM硫氰酸盐、100 mM铁和50%的矿浆密度浸出24小时，实现了最大金回收率（96%）。对最佳浸出条件的动力学研究表明，它遵循收缩核模型，其中速率控制机制是扩散过程。结合已发表的文献对这些结果进行了讨论。
